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@article{1468438,
author = {Bernhard, Klaus and Otero, Sebastian and Hummerich, Stefan and Kaltcheva, Nadia and Paunzen, Ernst and Bohlsen, Terry},
article_location = {MALDEN},
article_number = {3},
doi = {http://dx.doi.org/10.1093/mnras/sty1320},
keywords = {stars: circumstellar matter; Stars: early-type; stars: emission-line Be; stars: oscillations; stars: variables: general},
language = {eng},
issn = {0035-8711},
journal = {Monthly Notices of the Royal Astronomical Society},
title = {An investigation of the photometric variability of confirmed and candidate Galactic Be stars using ASAS-3 data},
url = {http://dx.doi.org/10.1093/mnras/sty1320},
volume = {479},
year = {2018}
}
TY - JOUR
ID - 1468438
AU - Bernhard, Klaus - Otero, Sebastian - Hummerich, Stefan - Kaltcheva, Nadia - Paunzen, Ernst - Bohlsen, Terry
PY - 2018
TI - An investigation of the photometric variability of confirmed and candidate Galactic Be stars using ASAS-3 data
JF - Monthly Notices of the Royal Astronomical Society
VL - 479
IS - 3
SP - 2909-2967
EP - 2909-2967
PB - WILEY
SN - 00358711
KW - stars: circumstellar matter
KW - Stars: early-type
KW - stars: emission-line Be
KW - stars: oscillations
KW - stars: variables: general
UR - http://dx.doi.org/10.1093/mnras/sty1320
N2 - We present an investigation of a large sample of confirmed (N = 233) and candidate (N = 54) Galactic classical Be stars (mean V magnitude range of 6.4-12.6 mag), with the main aim of characterizing their photometric variability. Our sample stars were preselected among early-type variables using light-curve morphology criteria. Spectroscopic information was gleaned from the literature, and archival and newly acquired spectra. Photometric variability was analysed using archival ASAS-3 time-series data. To enable a comparison of results, we have largely adopted the methodology of Labadie-Bartz et al. (2017), who carried out a similar investigation based on KELT data. Complex photometric variations were established in most stars: outbursts on different time-scales (in 73 +/- 5 per cent of stars), long-term variations (36 +/- 6 per cent), periodic variations on intermediate time-scales (1 +/- 1 per cent), and short-term periodic variations (6 +/- 3 per cent). 24 +/- 6 per cent of the outbursting stars exhibit (semi) periodic outbursts. We close the apparent void of rare outbursters reported by Labadie-Bartz et al. (2017) and show that Be stars with infrequent outbursts are not rare. While we do not find a significant difference in the percentage of stars showing outbursts among early-type, mid-type, and late-type Be stars, we show that early-type Be stars exhibit much more frequent outbursts. We have measured rising and falling times for well-covered and well-defined outbursts. Nearly all outburst events are characterized by falling times that exceed the rising times. No differences were found between early-, mid-, and late-type stars; a single non-linear function adequately describes the ratio of falling time to rising time across all spectral subtypes, with the ratio being larger for short events.
ER -
BERNHARD, Klaus, Sebastian OTERO, Stefan HUMMERICH, Nadia KALTCHEVA, Ernst PAUNZEN and Terry BOHLSEN. An investigation of the photometric variability of confirmed and candidate Galactic Be stars using ASAS-3 data. \textit{Monthly Notices of the Royal Astronomical Society}. MALDEN: WILEY, 2018, vol.~479, No~3, p.~2909-2967. ISSN~0035-8711. Available from: https://dx.doi.org/10.1093/mnras/sty1320.
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